It provides a kind of mosquito class to prevent and kill off with aerosol, the preventive effect excellent to mosquito class can be played for a long time, and reduce the influence for giving human body or pet. A kind of mosquito class is prevented and kill off with aerosol, and the capacity ratio (a/b) of aerosol stoste (a) and stock solution (b) is 10/90~50/50, and injection capacity when by jet button next time is 0.1~0.4mL, 90% partial size of the partial size of the jet particle R sprayed by jet port under the volume-cumulative distribution in 25 DEG C, spray distance 15cm is 10~80 μm, when jetted once aerosol stoste to processing space, residual rate is 0. in the air after 2 hours warps of insect-pest exterminating ingredient05~5%, and the effect duration of insect-pest exterminating ingredient is 20 hours or more to the spaces below 33m3.
